How to reverse the order of words in a C language strin…

To reverse the order of the words in a C language string, you can follow these steps:

1. invert the order of words
2. splitting a string into smaller tokens
3. Calculate the number of words.
4. Output each word in reverse order using a loop.

Here is an example code:

#include <stdio.h>
#include <string.h>

void reverse_words(char str[]) {
    char *token;
    char *words[100]; // 假设最多有100个单词
    int count = 0;
    
    // 使用strtok函数分割字符串并将每个单词存储在数组中
    token = strtok(str, " ");
    while (token != NULL) {
        words[count] = token;
        count++;
        token = strtok(NULL, " ");
    }
    
    // 倒序输出每个单词
    for (int i = count - 1; i >= 0; i--) {
        printf("%s ", words[i]);
    }
}

int main() {
    char str[] = "Hello World, I am a student.";
    reverse_words(str);
    
    return 0;
}

The output result is:

student. a am I World, Hello